package com.lu.reggie.controller;

import com.lu.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.util.UUID;

@Slf4j
@RestController
@RequestMapping("/common")
public class CommonController {
    @Value("${reggie.path}")
    private String basePath;

    /**
     * 文件上传
     * @param file
     * @return
     */
    @PostMapping("/upload")
    public R<String> upload(MultipartFile file) {
        log.info(file.toString());
        //因为是一个临时文件，所以需要指定存储位置，防止被清除
        //获取原始文件名
        String originalFilename = file.getOriginalFilename();
        //后缀名
        String suffix = originalFilename.substring(originalFilename.lastIndexOf("."));
        //为了防止重名，需要使用uuid随机生成
        String fileName = UUID.randomUUID().toString() + suffix;
        //创建目录
        File baseDir = new File(basePath);
        if (!baseDir.exists()) {
            //判断
            baseDir.mkdirs();
        }

        //指定转存位置
        try {
            file.transferTo(new File(basePath + fileName));
        } catch (IOException e) {
            e.printStackTrace();
        }
        //后续下载等功能需要用到该文件，所以返回文件名
        return R.success(fileName);
    }

    /**
     * 文件下载
     * @param name
     * @param response
     */
    @GetMapping("/download")
    public void download(String name, HttpServletResponse response) {
        try(  FileInputStream fileInputStream = new FileInputStream(new File(basePath + name));
              ServletOutputStream outputStream = response.getOutputStream()) {
            //设置输出格式
            response.setContentType("image/jpeg");
            //输出
            int length = 0;
            byte[] bytes = new byte[1024];
            while ((length = fileInputStream.read(bytes)) != -1) {
                outputStream.write(bytes, 0, length);
                outputStream.flush();
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}
